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I have the Pony express MIL eliminator, and I wanted to hook up an A/F ratio gauge. Probably one of those cheapie's from summit. Can I wire that into the Front O2 sensor? The one that is on the header collector before the turbo?

Those gauges are for show only, you will not get an accurate A/F reading. The front 02 which is the actual A/F sensor is a wideband type that cannot be used by the cheap A/F gauges, so you have to tap into the rear 02 which is a standard narrowband unit. Unfortunately this doesn't result in useful readings since the rear 02 is present only to measure catalyst efficiency and is located after the first two cats (if you still have them). Even if you're catless the rear sensor will only indicate within a very limited range.
The only accurate A/F gauges are the ones that use their own dedicated wideband sensor, but those aren't cheap.

Ok, cool thanks man....Since autometer released that instrument bezel, I've been itchin to put two more gauges in my car, so I was looking at the Digital type because they are the only ones that will match my Defi BF gauges.

I'll probably end up with Air Temp (used for Intake Air temp), and maybe pressure, which I can hook up to a water injection system to measure water pressure. Any other ideas?